package com.reggie.controller;

import com.reggie.configuration.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.UUID;

/**
 * 文件上传和下载
 */
@RestController
@RequestMapping("/common")
@Slf4j
public class CommonController {

    @Value("${reggie.path}")
    private String basePath;

    /**
     * 文件上传
     * @param file
     * @return
     */
    @PostMapping("/upload")
    public R<String> upload(MultipartFile file){
        //file是临时文件，需要转存到指定的位置，否则该请求结束后，临时文件会被删除
        log.info(file.toString());
        //获取原始文件名
        String originalFilename = file.getOriginalFilename();

        //截取.jpg
        String jpg = originalFilename.substring(originalFilename.lastIndexOf("."));

        //使用UUID修改文件名，防止文件名重复导致文件覆盖
        String fileName = UUID.randomUUID().toString() + jpg;
        
        //判断目录对象是否存在
        File dir = new File(basePath);

        //如果不存在，则创建该目录
        if(!dir.exists()){
            dir.mkdir();
        }

        try {
            //转存文件
            file.transferTo(new File(basePath + fileName ));
        } catch (IOException e) {
            e.printStackTrace();
        }
        return R.success(fileName);

    }

    @GetMapping("/download")
    public void download(String name, HttpServletResponse response){

        try {
            //通过输入流读取文件数据
            FileInputStream fileInputStream = new FileInputStream(new File(basePath + name));

            ServletOutputStream outputStream = response.getOutputStream();

            response.setContentType("imag/jpeg");

            int len = 0;
            byte[] bytes = new byte[1024];
            while ((len = fileInputStream.read(bytes))!=-1){
                outputStream.write(bytes);
                outputStream.flush();
            }

        } catch (Exception e) {
            e.printStackTrace();
        }


    }
}
